different between kickback vs sweetener

English

kick +? back.

kickback (countable and uncountable, plural kickbacks)

(countable) A backward kick, a retrograde movement of an extremity.
(countable, informal) A covert, often illegal, payment in return for a favor consisting of providing an opportunity of chargeable transaction.
(uncountable, firearms, machinery) Recoil; a sudden backward motion, usually in the direction of the operator.
(countable, machinery) An accident wherein an object being cut by a rotating blade or disk, such as a circular saw, is caught by the blade and thrown outward.
(oil industry) A dangerous buildup of gas pressure at the wellhead.
(countable, bowling) The board separating one bowling lane from another at the pit end.
(uncountable, bridge) In contract bridge, an ace asking convention initiated by the first step above four of the agreed trump suit.
(pinball) A feature that saves the ball from draining and propels it back into play.
A relaxed party.
Synonym: kicker

sweeten +? -er (“agent suffix”)

sweetener (plural sweeteners)

Something added to food to sweeten its taste, especially an artificial substitute for sugar.
(informal) Something given or added to added to a deal to sweeten another's attitude, especially a bribe or kickback.
(slang) A shill bidder at an auction.

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